I disagree with Simons above.
Just changed from 2 x 6ft T5 units to 4 x 4ft Philips T5 LED units. I have a far better spread of light and I’m now using 100w instead of 140w.
The colour is cooler but overall in my garage feel it is an improvement over what I had plus the LED’s should now last 10,000 hours.
Is it worth to from a money payback pint of view? I don’t know but all of my house lighting is now LED and my electricity bill is almost static across the year.
Edit – just looked at the screw fix link. Go to a proper electrical merchant for a better deal!